CN111914377A - Method and system for repairing feeder line loss model, computer equipment and readable storage medium - Google Patents
Method and system for repairing feeder line loss model, computer equipment and readable storage medium Download PDFInfo
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Abstract
The invention relates to a method and a system for repairing a feeder line loss model, a computer device and a readable storage medium. The method comprises the following steps: determining a key station area corresponding to an interconnection switch in a distribution network feeder line topological structure; acquiring electrical information of each key station area in a quasi-real time manner, wherein the working electrical information comprises a voltage amplitude of the key station area and a voltage phase angle of the key station area; judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time or not; if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node; and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, judging that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key station area.
Description
Technical Field
The invention relates to the technical field of power distribution network line loss calculation, in particular to a method and a system for repairing a feeder line loss model, a computer device and a readable storage medium.
Background
With the rapid development of social economy, the electricity utilization load continuously rises, the loss generated by transmission to users through a power grid is increased, the line loss of a power distribution network accounts for about 40% of the loss of the whole power grid according to statistics, wherein the line loss electricity quantity of a 10kV feeder line accounts for about 50%, therefore, under the background of quality improvement, efficiency improvement and cost compression of a power grid company, the reduction of the line loss rate of the power grid is one of important ways for reducing the cost, and the accurate calculation of the line loss of the feeder line is a basic condition for realizing abnormal line loss positioning and line loss treatment.
Under the high-reliability power supply requirements of compressing the power failure time of a user and reducing the power failure influence range, aiming at the situations of load transfer, planned maintenance, fault processing and the like which can not be avoided in a power distribution network, a common processing mode is to transfer partial load of a fault or high-load line from another feeder line which is in contact with the fault or high-load line for power supply, so that the feeder line power supply topological structure of the power distribution network is changed along with the supply transfer working condition. In the aspect of 10kV feeder line loss management, currently, monthly line loss calculation and daily line loss calculation are common, and in the aspect of monthly line loss calculation, if a single feeder line loss model is adopted for calculating the monthly feeder line loss, the result often cannot accurately reflect actual line loss, and huge influence is caused on the accuracy of line loss calculation; in the aspect of daily line loss calculation, the upgrading and upgrading of a power grid metering device and the quasi-real-time data acquisition of a 10kV feeder line and a station area to which the feeder line belongs enable daily feeder line loss calculation based on the metering and data acquisition, generally, the electric quantity of a metering point to which a certain feeder line belongs under a transformer substation is used as the electric quantity of supply, the electric quantity of the station area to which the feeder line belongs is used as the electric quantity of supply to establish a feeder line loss model, and then the feeder line loss is calculated. Although the calculation precision of the daily line loss is greatly improved compared with the monthly line loss, the topology of the feeder line changes in the transformer area under the original feeder line and the transformer area under the transformer feeder line under the transformer working condition, a line loss model established according to the line transformation file relation cannot be adjusted correspondingly, at the moment, the supply and output electricity quantity in the feeder line model is different from the real supply electricity quantity, so that the accuracy of the line loss rate of the feeder line is low, and a large negative abnormal line loss rate can be generated in serious cases.
Two common methods are used for treating abnormal line loss caused by a supply working condition, firstly, a line loss model is manually corrected, when a feeder line supply state is finished, the feeder line supply state needs to be manually restored to an initial state, the repeated correction process brings huge pressure to basic operation and maintenance work, and meanwhile, the timeliness and accuracy of line loss calculation are influenced by passive correction after the abnormal line loss occurs; and secondly, the interface of the distribution network topology relation system is opened and provided to automatically finish model correction, but the method needs to newly establish an interface and monitor the data transmission condition, so that the construction and application cost of the line loss calculation module is increased, and the sudden line transfer for topology structure change transmission information is delayed to a certain extent from the acquisition to the transmission to the line loss calculation module, so that the calculation timeliness is inevitably influenced.
Disclosure of Invention
Based on the method, the system, the computer device and the readable storage medium for repairing the feeder line loss model are used for automatically identifying the transfer condition to correct the feeder line loss model and improve the line loss calculation accuracy.
The invention provides a method for repairing a feeder line loss model, which comprises the following steps:
determining a key station area corresponding to an interconnection switch in a distribution network feeder line topological structure;
acquiring electrical information of each key station area in a quasi-real time manner, wherein the working electrical information comprises a voltage amplitude of the key station area and a voltage phase angle of the key station area;
judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time or not;
if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node;
and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, judging that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key station area.
In one embodiment, the obtaining electrical information of each of the critical zones in near real time includes:
and acquiring corresponding electrical information of the key station area from a metering master station according to the identification information of the key station area.
In one embodiment, the tie switch corresponds to three of the key zones;
the judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time includes:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
In one embodiment, the voltage of the key station area is three-phase voltage (u)iA,uiB,uiC) Wherein i is a positive integer;
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the variation trend of the acquisition time node or not, including:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
In one embodiment, the electrical information further includes a three-phase voltage imbalance of the critical pad area.
In one embodiment, when the voltage phase angles of all the critical station areas corresponding to the same tie switch change at the same acquisition time node, before determining that the feeder enters a transfer state, the method further includes:
and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging whether the three-phase voltage unbalance of each key station area is changed or not.
In one embodiment, the feeder line loss model is updated according to the last acquired parameter data of all the critical station areas.
Based on the same inventive concept, an embodiment of the present invention further provides a repair system for a feeder line loss model, including:
the acquisition module is used for determining key station areas corresponding to interconnection switches in a feeder line topological structure of the power distribution network and acquiring electrical information of each key station area in a quasi-real-time manner, wherein the working electrical information comprises a voltage amplitude of each key station area and a voltage phase angle of each key station area;
the judging module is electrically connected with the acquiring module and is used for judging whether the voltage amplitude values of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time; if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state; and
and the updating module is electrically connected with the judging module and used for updating the feeder line loss model according to the state of each key station area.
In one embodiment, the tie switch corresponds to three of the key zones;
the judgment module is configured to judge whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have a consistent change trend at the same acquisition time node, and is specifically configured to:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
In one embodiment, the voltage of the key station area is three-phase voltage (u)iA,uiB,uiC) Wherein i is a positive integer;
the determination module, configured to determine whether a voltage amplitude of the first key station area is consistent with a voltage amplitude of the second key station area in a variation trend of the acquisition time node, is configured to:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
Based on the same inventive concept, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to any of the above embodiments.
Based on the same inventive concept, an embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program executable on the processor, and the processor executes the computer program to implement the steps of the method according to any of the above embodiments.
In summary, the embodiment of the present invention provides a method and a system for repairing a feeder line loss model, a computer device, and a readable storage medium. Wherein the method comprises: determining a key station area corresponding to an interconnection switch in a distribution network feeder line topological structure; acquiring electrical information of each key station area in a quasi-real time manner, wherein the working electrical information comprises a voltage amplitude of the key station area and a voltage phase angle of the key station area; judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time or not; if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node; and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, judging that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key station area. In the invention, the electrical information of each key station area is obtained in a quasi-real time manner, whether a transfer condition occurs or not is determined according to the multiple judgment conditions of the electrical information of the key station areas, and the line loss feeder module is updated in time after the transfer condition is determined, so that the updating speed of the feeder line loss model is increased, and the line loss calculation accuracy is further improved.
Drawings
FIG. 1 is a simplified diagram of an exemplary power supply topology having a contact relationship;
fig. 2 is a schematic flow chart of a method for repairing a feeder line loss model according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another feeder line loss model repair method according to an embodiment of the present invention;
fig. 4 is an electrical structural schematic diagram of a repair system for a feeder line loss model according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It can be understood that the 10kV distribution network is located at the end of the power system, and is an important link for connecting the power generation system or the transmission and transformation system with the user equipment, and distributing and supplying electric energy to users, which has obvious regional characteristics along with the distribution of users, resulting in a more complex topology structure of the feeder in the distribution network compared with the transmission network, and the distribution difference of the power users of different feeders results in a larger difference in topology structure, and according to the nature of the feeders in the distribution network, the voltage distribution of different feeders in the key station area can be used as important marks for distinguishing different feeders, for example, in fig. 1, the voltage data of the station areas 1, 2 and 3 on two feeders have a certain difference due to the difference in topology structure of the two feeders and the power consumption situation of users on the line.
At present, for the calculation and repair of the line loss of the feeder line under the condition of transferring the 10kV feeder line to the power supply, a line loss calculation model is manually corrected after the line loss is found to be abnormal manually, or an interface is created with other systems to obtain a new line power supply topological structure, so that the existing feeder line loss model has high dependence on manual work or other systems under the condition of transferring the feeder line to the power supply, the response speed is low, and the accuracy of a line loss calculation result is low. And the passive correction workload of manually judging the switching working condition is large, the post-abnormal correction after the calculation according to the daily line loss has large time delay, and the line loss with small switching influence can be processed in a missing way, so that the line loss calculation precision is low. In addition, the development cost of an interface is increased when other systems provide a circuit topological structure through a data interface, and a certain time delay exists from the condition of switching to the condition of transmitting to the line loss calculation function module when the condition is monitored.
Based on the method, the invention can provide a method for repairing the feeder line loss model, which utilizes the existing collected data to automatically identify the transfer working condition so as to repair the line loss model, and improves the precision of the line loss calculation result. Referring to fig. 2 and fig. 3, the method for repairing the feeder line loss model includes:
step S210, determining a key station area corresponding to the interconnection switch in a feeder line topological structure of the power distribution network;
step S220, acquiring electrical information of each key station area in a quasi-real-time manner, wherein the working electrical information comprises a voltage amplitude of the key station area and a voltage phase angle of the key station area;
step S230, judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time;
step S240, when the voltage amplitudes of all the key station areas corresponding to the same interconnection switch have the same change trend at the same acquisition time node, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node;
step S260, when the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, determining that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key station area.
Taking the distribution network shown in fig. 1 as an example, a key station area (or transformer) is determined by taking a tie switch S2 in a distribution network feeder single line diagram as a center, and the key station area is respectively a key station area 1, a key station area 2 and a key station area 3, which are on an original power supply feeder i and are closest to S2, and a feeder ii and is closest to S2. It should be noted that "nearest" here is the nearest in topology, and usually the first transformer "T-connected" on the trunk line is used as the nearest station, i.e. the key station corresponding to the interconnection switch.
In the embodiment of the invention, the electrical information of each key station area is obtained in a quasi-real-time manner, and whether the transfer condition occurs or not is determined according to the multiple judgment conditions of the electrical information of the key station areas, so that the accuracy of monitoring the transfer working condition is ensured, and the authenticity of a feeder line loss calculation model is improved; and moreover, the line loss feeder module is updated in time after the transfer condition is determined, the updating speed of the feeder line loss model is increased, and the line loss calculation accuracy is further improved. In the monitoring process, the time interval for acquiring the electrical information can be 5min, 10min and the like, and the specific duration can be set according to actual needs.
In one embodiment, the obtaining electrical information of each of the critical zones in near real time includes:
and acquiring corresponding electrical information of the key station area from a metering master station according to the identification information of the key station area.
In this embodiment, identification information of a first key station area (i.e., key station area 1), a second key station area (i.e., key station area 2), and a third key station area (i.e., key station area 3) is obtained from a metering master station, and electrical information of each key station area sent by a corresponding negative control terminal or distribution substation terminal is obtained; wherein the electrical information includes at least a region voltage amplitude (U)iA、UiB、UiC) And voltage phase angle
Where i denotes the critical zones 1, 2, 3, respectively. Namely, whether the transfer occurs or not and the time point when the transfer occurs can be identified by directly utilizing the data of the metering and collecting system, so that the operation and maintenance workload of abnormal line loss under the working condition of the transfer is reduced, and the design and development cost for judging whether the required data is transferred or not by opening other system interfaces is reduced.
In one embodiment, the tie switch corresponds to three of the key zones;
the judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time includes:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
It can be understood that the voltages and the variation trends of the high-voltage sides of the key distribution areas (or distribution transformers) belonging to the same feeder line have certain consistency, so that the voltage amplitude and the variation trend of the distribution areas collected in the metering system are used for identifying the supply transfer working condition to complete the automatic repair of the feeder line loss model, the voltages of the key distribution areas before and after the supply transfer occurs have larger difference, and the voltage difference before and after the supply transfer is used as the basis for judging whether the supply transfer occurs or not.
In this embodiment, the three-phase voltage (U) of the first critical distribution area is used first1A、U1B、U1C) And three phase voltage (U) of the second key station area2A、U2B、U2C) The size and the variation trend thereof are used as triggering conditions for monitoring whether the supply transfer working condition occurs or not. If the three-phase voltage amplitude and the variation trend thereof on the first key distribution area have similarity with the three-phase voltage amplitude and the variation trend thereof on the second key distribution area,the next step is entered. For example, according to UiA、UiB、UiC(wherein i is 1, 2), that is, when the same acquisition time increases/decreases simultaneously with respect to the phase voltage corresponding to the previous acquisition time, the method for repairing the feeder line loss model is triggered to perform the next operation, that is, the phase voltages corresponding to the previous acquisition time node increase/decrease simultaneously with respect to the same acquisition time node in the first key station area and the second key station area are used as trigger conditions. That is, in the embodiment, the three-phase voltage amplitudes and the variation trends of the three-phase voltages in the two key transformer areas are monitored simultaneously to serve as the primary trigger condition, so that the influence of sudden increase or sudden shutdown of the power load of the distribution transformer area on the judgment condition that the three-phase voltage is changed into the primary condition is avoided, and the misjudgment probability and the calculation resource consumption are reduced.
Monitoring three-phase voltage (U) of first key station area1A、U1B、U1C) And three phase voltage (U) of the second key station area2A、U2B、U2C) After the size and the variation trend thereof have similar variation trends, the three-phase voltage amplitude (U) of the key station area 3 is judged3A、U3B、U3C) Whether the variation trend of the voltage has a similar variation trend with the first key station area and the second station area at the same acquisition time point, and the voltage of the station area at the next voltage acquisition point, for example: if the same acquisition time UiA、UiB、UiC(where i-1, 2, 3) have the same size ordering, and/or at the same time U3A、U3B、U3CRelative to the previous time and UiA、UiB、UiC(where i is 1, 2) have the same increasing/decreasing trend, then all the key stations corresponding to the tie switch S2 are assumed to have the same trend of node change at the same acquisition time.
In one embodiment, the voltage of the key station area is three-phase voltage (U)iA、UiB、UiC) Wherein i is a positive integer;
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the variation trend of the acquisition time node or not, including:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
In this embodiment, whether the voltage amplitude of the first key station area and the voltage amplitude of the second key station area have the same variation trend at the acquisition time node is determined, which generally includes two steps: firstly, determining the variation trend of the voltage amplitude value of each phase voltage corresponding to the key station area at the acquisition time node according to the electrical information corresponding to the key station area; i.e. separately acquire UiA、UiB、UiCThe variation and the variation trend of the voltage amplitude value relative to the last collected etching; then, the A phase voltage U of the first key station area is judged1AAnd the variation trend of the second key station area and the A-phase voltage U of the second key station area2AWhether the variation trends of the first key station area are consistent or not, and the phase-B voltage U of the first key station area1BAnd the variation trend of the second key station area and the B-phase voltage U of the second key station area2BWhether the variation trends of the first key station area are consistent or not, and the C-phase voltage U of the first key station area1CAnd the variation trend of the second key station area and the C-phase voltage U of the second key station area2CWhether the variation trends of the voltage values are consistent or not and determining the variation trend of the voltage amplitude of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area; due to the same feeder lineThe voltage changes are consistent, and therefore the changes of the phase voltages should be consistent when the transfer occurs.
In addition, when a certain distribution line in the power distribution network is supplied, voltage amplitude of each key station area can be changed, and voltage phase angle of each key station area can be correspondingly changed, so that the key station areas 1-3 are monitored
(wherein i is 1, 2, 3) changes at the same acquisition time node, when the switching working condition occurs, the three-phase voltage of 3 key transformer areas changes due to the power supply line or the topological structure, and the three-phase voltage of 3 transformers
And the data is changed at the same time, and the data is taken as a judgment condition to filter out factors such as disturbance of acquired data and the like, so that the accuracy of the working condition of the transfer supply is further improved.
One possibility that the 10kV feeder line enters the transfer supply operation mode is to isolate faults in the line, and common faults in the distribution line are single-phase grounding, so that the voltage unbalance degree with obvious three-phase voltage during single-phase grounding can be used as an auxiliary judgment identifier. Based on this, in one embodiment, the electrical information further includes a three-phase voltage unbalance degree of the key station area, and the voltage unbalance degree with the obvious three-phase voltage is used as an auxiliary identifier for judging whether the transfer occurs or not in the judging process, so that the judging accuracy is further improved.
In one embodiment, when the voltage phase angles of all the critical station areas corresponding to the same tie switch change at the same acquisition time node, before determining that the feeder line enters the transfer state, the method further includes:
step S250, judging whether the three-phase voltage unbalance of each key platform area is changed or not; and if so, judging that the feeder line enters a transfer state.
It can be understood that when a 10kV feeder enters into a transfer operation due to a single-phase ground fault and the like of one of the key station areas, the three-phase unbalance of the key station area can be obviously changed, while the change of the three-phase unbalance of the other key station areas is not obvious, so that the determination of whether the three-phase voltage unbalance of each key station area changes can be used as an auxiliary means for determining whether the transfer occurs, the transfer caused by the fault is timely identified, and the accuracy of the determination is further improved.
Further, after the transfer condition is determined to actually occur, the feeder line loss model needs to be updated in order to enable the feeder line loss model and the feeder line power supply topological structure of the current power distribution network. Based on this, in one embodiment, the feeder line loss model is updated according to the last acquired parameter data of all the key station areas.
In this embodiment, when it is determined that a transfer occurs in the feeder line ii according to the key station areas 1, 2, and 3, for example, the tie switch S1 is turned off, and the tie switch S2 is turned on, the feeder line loss model is updated according to the electrical information of each key station area acquired last time from the metering master station, so that the updated feeder line loss model is consistent with an actual power supply situation.
Based on the same inventive concept, an embodiment of the present invention further provides a repair system for a feeder line loss model, please refer to fig. 4, where the repair system for a feeder line loss model includes an obtaining module 410, a determining module 420, and an updating module 430.
The obtaining module 410 is configured to determine a key station area corresponding to a tie switch in a feeder topology structure of a power distribution network, and obtain electrical information of each key station area in a quasi-real-time manner, where the working electrical information includes a voltage amplitude of the key station area and a voltage phase angle of the key station area.
The determining module 420 is electrically connected to the obtaining module 410, and is configured to determine whether voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend at the same collecting time node; if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node; and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state.
The updating module 430 is electrically connected to the determining module 420, and is configured to update the feeder line loss model according to a state of each of the key distribution areas.
Aiming at various problems existing in the line loss calculation of the feeder line under the current 10kV feeder line transfer working condition, the embodiment of the invention ensures the accuracy of monitoring the transfer working condition and improves the authenticity of a feeder line loss calculation model by acquiring the electrical information of each key station area in a quasi-real-time manner and determining whether the transfer condition occurs according to multiple judgment conditions of the electrical information of the key station areas; and moreover, the line loss feeder module is updated in time after the transfer condition is determined, the updating speed of the feeder line loss model is increased, and the line loss calculation accuracy is further improved.
In one embodiment, the interconnection switch corresponds to three key transformer areas, and the three key transformer areas are the first transformers which are connected with T and are closest to the interconnection switch in a power distribution network topological structure and serve as the key transformer areas;
the determining module 420 is configured to determine whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have a consistent variation trend at the same collection time node, and specifically configured to:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
It can be understood that the voltages and the variation trends of the high-voltage sides of the key distribution areas (or distribution transformers) belonging to the same feeder line have certain consistency, so that the voltage amplitude and the variation trend of the distribution areas collected in the metering system are used for identifying the supply transfer working condition to complete the automatic repair of the feeder line loss model, the voltages of the key distribution areas before and after the supply transfer occurs have larger difference, and the voltage difference before and after the supply transfer is used as the basis for judging whether the supply transfer occurs or not. In the embodiment, the three-phase voltage amplitude and the change trend of the three-phase voltage amplitude of two key transformer areas are monitored simultaneously to serve as the primary trigger condition, so that the influence of sudden increase or sudden shutdown of the power load of the distribution transformer area on the judgment condition that the three-phase voltage is changed into the primary condition is avoided, and the misjudgment probability and the calculation resource consumption are reduced.
In one embodiment, the voltage of the key station area is three-phase voltage (u)iA,uiB,uiC) Wherein i is a positive integer;
the determining module 420 for determining whether the voltage amplitude of the first critical area and the voltage amplitude of the second critical area have a consistent trend at the collection time node, has a function for:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
In this embodiment, whether the voltage amplitude of the first key station area and the voltage amplitude of the second key station area have the same variation trend at the acquisition time node is determined, which generally includes two steps: firstly, determining the variation trend of the voltage amplitude value of each phase voltage corresponding to the key station area at the acquisition time node according to the electrical information corresponding to the key station area; i.e. separately acquire UiA、UiB、UiCThe variation and the variation trend of the voltage amplitude value relative to the last collected etching; then, the A phase voltage U of the first key station area is judged1AAnd the variation trend of the second key station area and the A-phase voltage U of the second key station area2AWhether the variation trends of the first key station area are consistent or not, and the phase-B voltage U of the first key station area1BAnd the variation trend of the second key station area and the B-phase voltage U of the second key station area2BWhether the variation trends of the first key station area are consistent or not, and the C-phase voltage U of the first key station area1CAnd the variation trend of the second key station area and the C-phase voltage U of the second key station area2CWhether the variation trends of the voltage values are consistent or not and determining the variation trend of the voltage amplitude of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area; since the voltage changes on the same feeder line are consistent, the changes of the phase voltages should be consistent when the transfer occurs.
In addition, when a certain distribution line in the power distribution network is supplied, voltage amplitude of each key station area can be changed, and voltage phase angle of each key station area can be correspondingly changed, so that the key station areas 1-3 are monitored
(wherein i is 1, 2, 3) changes at the same acquisition time node, when the switching working condition occurs, the three-phase voltage of 3 key transformer areas changes due to the power supply line or the topological structure, and the three-phase voltage of 3 transformers
And the data is changed at the same time, and the data is taken as a judgment condition to filter out factors such as disturbance of acquired data and the like, so that the accuracy of the working condition of the transfer supply is further improved.
In one embodiment, the electrical information further includes a three-phase voltage imbalance of the critical pad area. When the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, before the determination of the power transfer, the determination module 420 is further configured to determine whether the three-phase voltage imbalance of each key station area changes. In this embodiment, whether the three-phase voltage unbalance of each key distribution room changes or not can be used as an auxiliary means for determining whether the transfer occurs or not, so that the transfer caused by a fault can be identified in time, and the accuracy of determination is further improved.
Based on the same inventive concept, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, can implement the steps of the method of any of the above embodiments.
Based on the same inventive concept, an embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program executable on the processor, and the processor executes the computer program to implement the steps of the method according to any of the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A method for repairing a feeder line loss model is characterized by comprising the following steps:
determining a key station area corresponding to an interconnection switch in a distribution network feeder line topological structure;
acquiring electrical information of each key station area in a quasi-real time manner, wherein the working electrical information comprises a voltage amplitude of the key station area and a voltage phase angle of the key station area;
judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time or not;
if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node;
and when the voltage phase angles of all the key station areas corresponding to the same interconnection switch change at the same acquisition time node, judging that the feeder line enters a transfer state, and updating the feeder line loss model according to the state of each key station area.
2. A method for repairing a feeder line loss model as claimed in claim 1, wherein said obtaining electrical information of each of said critical sections in near real time comprises:
and acquiring corresponding electrical information of the key station area from a metering master station according to the identification information of the key station area.
3. A method of repairing a feeder line loss model as claimed in claim 1, wherein said tie switches correspond to three of said critical areas;
the judging whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time includes:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
4. A method of repairing a feeder line loss model as claimed in claim 3, wherein the electricity of said critical area isThe voltages are all three-phase voltages (u)iA,uiB,uiC) Wherein i is a positive integer;
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the variation trend of the acquisition time node or not, including:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
5. A method of repairing a feeder line loss model as claimed in claim 1, wherein said electrical information further comprises a three-phase voltage imbalance of said critical pad area.
6. A method of repairing a feeder line loss model as claimed in claim 5, wherein when the voltage phase angles of all said critical sections corresponding to the same tie switch change at the same acquisition time node, before determining that said feeder line enters a transition state, further comprising:
and judging whether the three-phase voltage unbalance of each key station area is changed or not.
7. The method for repairing a feeder line loss model according to claim 1, wherein the feeder line loss model is updated according to the last acquired parameter data of all the critical transformer areas.
8. A repair system for a feeder line loss model, comprising:
the acquisition module is used for determining key station areas corresponding to interconnection switches in a feeder line topological structure of the power distribution network and acquiring electrical information of each key station area in a quasi-real-time manner, wherein the working electrical information comprises a voltage amplitude of each key station area and a voltage phase angle of each key station area;
the judging module is electrically connected with the acquiring module and is used for judging whether the voltage amplitude values of all the key distribution areas corresponding to the same interconnection switch have the same change trend of the nodes at the same acquisition time; if yes, judging whether the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the acquisition time node; when the voltage phase angles of all the key station areas corresponding to the same interconnection switch are changed at the same acquisition time node, judging that the feeder line enters a transfer state; and
and the updating module is electrically connected with the judging module and used for updating the feeder line loss model according to the state of each key station area.
9. A repair system for a feeder line loss model as claimed in claim 8, wherein said tie switch corresponds to three of said critical areas;
the judgment module is configured to judge whether the voltage amplitudes of all the key distribution areas corresponding to the same interconnection switch have a consistent change trend at the same acquisition time node, and is specifically configured to:
judging whether the voltage amplitude of the first key station area is consistent with the voltage amplitude of the second key station area in the change trend of the acquisition time node;
and if so, judging whether the voltage amplitude of the third key station area is consistent with the change trend of the voltage amplitude of the first key station area and/or the second key station area at the acquisition time node or not.
10. A repair system for a feeder line loss model as claimed in claim 9, wherein the voltages of the critical sections are all three-phase voltages (u [ ])iA,uiB,uiC) Wherein i is a positive integer;
the determination module, configured to determine whether a voltage amplitude of the first key station area is consistent with a voltage amplitude of the second key station area in a variation trend of the acquisition time node, is configured to:
determining a variation trend of the voltage amplitude of each phase voltage corresponding to the first key station area at the acquisition time node according to the electrical information corresponding to the first key station area; determining a change trend of the voltage amplitude value of each phase voltage corresponding to the second key station area at the acquisition time node according to the electrical information corresponding to the second key station area;
and judging whether the variation trend of the phase-A voltage of the first key station area is consistent with that of the phase-A voltage of the second key station area, whether the variation trend of the phase-B voltage of the first key station area is consistent with that of the phase-B voltage of the second key station area, and whether the variation trend of the phase-C voltage of the first key station area is consistent with that of the phase-C voltage of the second key station area.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
12. A computer device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 7.
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